It may be a problem with the specific DOCX file you try the command with... So create a very simple DOCX document of your own first. Use LibreOffice itself for this. Write "Hello World!" on an otherwise empty page. Save it as DOCX.
It may be a problem with the specific DOCX file you try the command with... So create a very simple DOCX document of your own first. Use LibreOffice itself for this. Write "Hello World!" on an otherwise empty page. Save it as DOCX.